CN208337671U - A kind of voice de-noising amplifying circuit - Google Patents
A kind of voice de-noising amplifying circuit Download PDFInfo
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- CN208337671U CN208337671U CN201820920409.9U CN201820920409U CN208337671U CN 208337671 U CN208337671 U CN 208337671U CN 201820920409 U CN201820920409 U CN 201820920409U CN 208337671 U CN208337671 U CN 208337671U
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Abstract
本实用新型公开了一种语音降噪放大电路，包括在语音信号输入端与语音信号输出端之间依次连接有第一级降噪电路、第二级降噪电路和放大器；第一级降噪电路、第二级降噪电路还分别经稳压器与供电电源相连接；所述的第一级降噪电路、第二级降噪电路为结构相同的SDNR‑1降噪电路。本实用新型提供的电路在不通话时，环境噪声不能使语音识别控制电路激活，噪音不能通过受话器进入电路。通话时，话音可以将语音识别控制电路激活，使语音信号放大、传输；而背景噪音仍受到抗噪电路的抑制，达到去除背景噪音的效果，对话音进行实时跟随放大播放。
The utility model discloses a speech noise reduction amplifying circuit, which comprises a first-stage noise reduction circuit, a second-stage noise reduction circuit and an amplifier sequentially connected between a speech signal input end and a speech signal output end; The circuit and the second-stage noise reduction circuit are respectively connected to the power supply through a voltage stabilizer; the first-stage noise reduction circuit and the second-stage noise reduction circuit are SDNR-1 noise reduction circuits with the same structure. When the circuit provided by the utility model is not talking, the environmental noise cannot activate the speech recognition control circuit, and the noise cannot enter the circuit through the receiver. During a call, the voice can activate the voice recognition control circuit to amplify and transmit the voice signal; the background noise is still suppressed by the anti-noise circuit to achieve the effect of removing background noise, and the voice is amplified and played in real time.
Description
Technical field
The utility model belongs to digitlization communicating tech field, is related to a kind of voice de-noising amplifying circuit.
Background technique
Currently, the problems such as generally existing noise pollution of the industries such as cement, mine, metallurgy is serious.With digitlization call system
System can effectively reduce noise, improve speech quality.Voice de-noising amplification is mainly used for digitizing in phone system, and the system is wide
General to be used in the noises rugged environment such as vehicle-mounted, airborne, coal mine, mining, weaving, effect is voice amplification, filters out and makes an uproar
Sound drives loudspeaker (or earphone), to meet the call needs of high quality.
Utility model content
The utility model is solved the problems, such as to be to provide a kind of voice de-noising amplifying circuit, be solved in high-noise environment
The technical problem of speech quality ensure that digitlization phone system main performance well.
The utility model is to be achieved through the following technical solutions:
A kind of voice de-noising amplifying circuit is connected in turn between speech signal input and voice signal output end
Level-one Dolby circuit, second level Dolby circuit and amplifier；First order Dolby circuit, second level Dolby circuit are also respectively through pressure stabilizing
Device is connected with power supply；The first order Dolby circuit, second level Dolby circuit are the identical SDNR-1 noise reduction of structure
Circuit；
Speech signal input is connect by connecting capacitor with the input terminal of first order Dolby circuit, first order Dolby circuit
Output end by connect capacitor connect with the input terminal of second level Dolby circuit, the output end of second level Dolby circuit passes through company
It connects capacitor to connect with amplifier, the output end of amplifier is connected with voice signal output end.
The SDNR-1 Dolby circuit includes SDNR-1 integrated circuit board, and 1 foot is grounded by capacitor C14；2 feet pass through
Capacitor C15, resistance R10 are connect with 21 feet；3 feet by the RC parallel circuit that is made of the capacitor C24, the resistance R12 that are in parallel with
Regulated power supply Vcc is connected；4 feet are connect by capacitor C16, resistance R13 with 23 feet；5 feet are grounded by capacitor C17；6 feet pass through
Capacitor C27 ground connection, 7 feet are grounded by capacitor C26, and resistance R14 is also connected between 6 feet and 7 feet；8 feet ground connection；12 feet pass through electricity
Hold C19 ground connection；13 feet, 18 feet ground connection；20 feet are connected with resistance R11, resistance R9 respectively, resistance R9 also pass through capacitor C22 with
Circuit signal input Vin is connected, and resistance R11 is connected with resistance R10,21 feet respectively；23 feet also pass through capacitor C21, electricity
Resistance R15 is connected with circuit signal output end vo.
The amplifier includes comparator U2A, normal phase input end through capacitor C27 connection signal input terminal, through resistance
R18 connection working power；Its inverting input terminal is grounded through resistance R19, capacitor C26, through resistance R21, resistance R20 and output end phase
Connection, capacitor C28 are in parallel with resistance R21；Its output end is connected through capacitor C29, resistance R22 with signal output end, resistance
R22 also passes through resistance R25 and is grounded；Wherein capacitor C28 is the self-excitation filter clutter that disappears, and resistance R18 and resistance R17 are provided partially for amplifier
Set voltage.
Compared with prior art, the utility model has technical effect beneficial below:
Voice de-noising amplifying circuit provided by the utility model swashs formula dynamic following circuit SDNR-1 noise reduction electricity using talking about
Road, technological precedence, function admirable can be conversed under high-noise environment.When not conversing, ambient noise cannot make speech recognition controlled
Circuit activation, noise cannot enter circuit by receiver.When call, speech can make speech recognition controlled Circuit activation
Voice signal amplification, transmission；And background noise is still inhibited by anti-noise circuit, achievees the effect that remove background noise, dialogue
Sound carries out that amplification is followed to play in real time, and the circuit start time is less than 10 μ s.
The utility model has the advantages that easy to use, outward element is few and small product size is small.It not only makes user
It converses in strong noise and is easy, is clear, can also thoroughly avoid the invasion and damage of noise on human body, make long-term work in noise ring
Staff's physical and mental health under border is guaranteed, and has a very important significance to the call of high quality.Currently, cement, mine
The problems such as generally existing noise pollution of the industries such as mountain, metallurgy is serious.Noise can be effectively reduced with digitlization phone system, is mentioned
High speech quality.Therefore, with the technology transplant of this project and popularization and application, damage, the raising to noise to the person are worked
Productivity brings good society, economy and ecological benefits.
Detailed description of the invention
Fig. 1 is voice de-noising amplifying circuit functional block diagram；
Fig. 2 is SDNR-1 Dolby circuit connection schematic diagram；
Fig. 3 is SDNR-1 integrated circuit board principle of noise reduction schematic diagram；
Fig. 4 is first order voice de-noising circuit input-output wave shape schematic diagram；
Fig. 5 is amplifier circuit connection schematic diagram；
Fig. 6 is voice de-noising amplifying circuit connection schematic diagram.
Specific embodiment
The utility model is described in further detail below with reference to specific embodiment, described is to the utility model
Explanation rather than limit.
In digitlization voice de-noising phone system, basic procedure is the voice signal come from the transmission such as microphone or radio station
It handles, send to control centre and loudspeaker or earphone, the utility model is to voice de-noising amplifying circuit through voice de-noising amplifying circuit
To improve.
Referring to Fig. 1, be connected in turn between speech signal input and voice signal output end first order Dolby circuit,
Second level Dolby circuit and amplifier；First order Dolby circuit, second level Dolby circuit are also respectively through voltage-stablizer and power supply
It is connected；The first order Dolby circuit, second level Dolby circuit are the identical SDNR-1 Dolby circuit of structure；
Speech signal input is connect by connecting capacitor with the input terminal of first order Dolby circuit, first order Dolby circuit
Output end by connect capacitor connect with the input terminal of second level Dolby circuit, the output end of second level Dolby circuit passes through company
It connects capacitor to connect with amplifier, the output end of amplifier is connected with voice signal output end.
SDNR-1 Dolby circuit, amplifier are further described separately below.
1) SDNR-1 Dolby circuit
Referring to fig. 2, SDNR-1 Dolby circuit includes SDNR-1 integrated circuit board (- 24 foot of 1 foot inverse time since 1 foot in figure
Needle arrangement, other pins do not show label), 1 foot is grounded by capacitor C14；2 feet pass through capacitor C15, resistance R10 and 21 feet
Connection；3 feet are connected by the RC parallel circuit being made of the capacitor C24, the resistance R12 that are in parallel with regulated power supply Vcc；4 feet
It is connect by capacitor C16, resistance R13 with 23 feet；5 feet are grounded by capacitor C17；6 feet are grounded by capacitor C27, and 7 feet pass through electricity
Hold C26 ground connection, resistance R14 is also connected between 6 feet and 7 feet；8 feet ground connection；12 feet are grounded by capacitor C19；13 feet, 18 feet connect
Ground；20 feet are connected with resistance R11, resistance R9 respectively, and resistance R9 also passes through capacitor C22 and is connected with circuit signal input Vin
It connects, resistance R11 is connected with resistance R10,21 feet respectively；23 feet also pass through capacitor C21, resistance R15 and circuit signal output end
Vo is connected.
SDNR-1 integrated circuit board be commercially available noise reduction integrated circuit, mainly by amplifier, attenuator, attenuation control circuit,
Level detector, noise monitor device and level monitoring circuit composition.Referring to Fig. 3, SDNR-1 integrated circuit board uses necessary
Amplifier, attenuator, level detector etc. are formed by circuit；The microphone amplifier for including uses mute, transmission attenuation device, prison
The background path of examining system transmission, and be path detection.SDNR-1 integrated circuit board disabling pin allows to save power circuit not
It disables when in use.Transmission attenuation device plays logarithm, by the control of attenuation control circuit, make its gain be basically stable at-
40dB.The input signal of attenuation control circuit is from transmission level comparator and sends ambient noise monitor, the control circuit
Output control send gain.
In order to which sound of speaking is distinguished from ambient noise, SDNR-1 integrated circuit intralamellar part is provided with ambient noise
Monitor.Sending ambient noise monitor has a level detector to show the direct current level values of ambient noise, and monitor is to letter
The gain of number level is swift in response (3. foot level can rapid decrease), it is ensured that the continuous response of sound of speaking.Whole system is wanted
Averaging signal of speaking is 4~5dB stronger than background noise level, correctly to detect sound of speaking.When only ambient noise is deposited
When, the output of monitor will indicate that no voice exists, and circuit is made to become light condition, send ambient noise monitoring
Device can be forbidden by the method for being grounded 3. foot.
First order voice de-noising circuit input-output wave shape schematic diagram shown in Figure 4, it can be seen that by level-one
Voice de-noising is obvious after reason.
2) amplifier
Requirement is not achieved by the voice signal amplitude of two-stage noise reduction, it is necessary to pass through enhanced processing.The utility model
It using in-phase amplifier, is then divided, reaches requirement.
Referring to Fig. 5, the amplifier includes comparator U2A, and normal phase input end is inputted through capacitor C27 connection signal
It holds, through resistance R18 connection working power；Its inverting input terminal is grounded through resistance R19, capacitor C26, through resistance R21, resistance R20
It is connected with output end, capacitor C28 is in parallel with resistance R21；Its output end is through capacitor C29, resistance R22 and signal output end phase
Connection, resistance R22 also pass through resistance R25 and are grounded；Wherein capacitor C28 is the self-excitation filter clutter that disappears, and resistance R18 and resistance R17 are to put
Big device provides bias voltage.
Amplification of the amplifier to signal are as follows: Vo=R25/ (R22+R25) * (1+ (R21+R20)/R19) * Vin
Voice de-noising amplifying circuit application range is very extensive, can be used in various high-noise environments.It is existing logical
If news product introduces this patented technology, the noise robustness of complete machine will be greatly improved, to open up the application of existing product
Range improves the competitiveness of product.Antinoise phone system is best suited for public place, industrial and mining enterprises and other noise fields institute,
Market demand is very big, accesses this product in radio station front end, so that it may keep clear with the external world in the high-noise environment of 120dB
Clear communication.
Specific embodiment is given below.
Two-stage SDNR-1 Dolby circuit is connect by circuit connection diagram shown in Figure 6 with amplifier, voltage-stablizer connects i.e.
It can.The technical performance index of the voice de-noising amplifying circuit is as shown in the table.
Example given above is to realize that the utility model preferably example, the utility model is not limited to above-mentioned implementation
Example.Those skilled in the art according to the technical characteristic of technical solutions of the utility model made it is any it is nonessential addition,
Replacement, belongs to the protection scope of the utility model.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820920409.9U CN208337671U (en) | 2018-06-14 | 2018-06-14 | A kind of voice de-noising amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820920409.9U CN208337671U (en) | 2018-06-14 | 2018-06-14 | A kind of voice de-noising amplifying circuit |
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| Publication Number | Publication Date |
|---|---|
| CN208337671U true CN208337671U (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820920409.9U Expired - Fee Related CN208337671U (en) | 2018-06-14 | 2018-06-14 | A kind of voice de-noising amplifying circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110255002A (en) * | 2019-05-14 | 2019-09-20 | 北京戴纳实验科技有限公司 | A kind of decomposable environment-friendly trash can of use for laboratory |
-
2018
- 2018-06-14 CN CN201820920409.9U patent/CN208337671U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110255002A (en) * | 2019-05-14 | 2019-09-20 | 北京戴纳实验科技有限公司 | A kind of decomposable environment-friendly trash can of use for laboratory |
| CN110255002B (en) * | 2019-05-14 | 2022-04-22 | 北京戴纳实验科技有限公司 | Decomposable environment-friendly garbage can for laboratory |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |